On today's show, we celebrate the dubious holiday that is Foursquare Day (coming tomorrow), Skype has an Android vulnerability that Donald thinks might just be a feature, and Nintendo is going HD just in time for people to stop buying video games. Also, Best Buy says DVD windowing is totally working, if you enjoy manipulating customers into continuing to pay for a dying format. And Priceline founder Jay Walker sues most of the Internet. --Molly

At the D: All Things Digital conference, Walt Mossberg sits down with 3D evangelist and DreamWorks Animation CEO Jeffrey Katzenberg to talk consumer electronics and, of course, 3D's place in the movie world.